<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        div{
            background-color: black;
            width: 200px;
            height: 200px;
            color: #fff;
        }
        div:hover{
            border: 8px solid red;
            background-color: #fff;
            color: black;

        }
    </style>
</head>
<body>
    <div>
        鼠标滑过改变样式
    </div>
    
</body>
</html>